From: Patrick Steinhardt <ps@pks.im>
Date: Fri, 29 Dec 2023 07:27:00 +0000 (+0100)
Subject: builtin/rev-parse: introduce `--show-ref-format` flag
X-Git-Tag: v2.44.0-rc0~78^2~3
X-Git-Url: http://git.ipfire.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=3c4a5318afb4978a037c83ccd9bbeb870b3f0543;p=thirdparty%2Fgit.git

builtin/rev-parse: introduce `--show-ref-format` flag

Introduce a new `--show-ref-format` to git-rev-parse(1) that causes it
to print the ref format used by a repository.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index 912fab9f5e..546faf9017 100644
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -307,6 +307,9 @@ The following options are unaffected by `--path-format`:
 	input, multiple algorithms may be printed, space-separated.
 	If not specified, the default is "storage".
 
+--show-ref-format::
+	Show the reference storage format used for the repository.
+
 
 Other Options
 ~~~~~~~~~~~~~
diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index 917f122440..d08987646a 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -1062,6 +1062,10 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 				puts(the_hash_algo->name);
 				continue;
 			}
+			if (!strcmp(arg, "--show-ref-format")) {
+				puts(ref_storage_format_to_name(the_repository->ref_storage_format));
+				continue;
+			}
 			if (!strcmp(arg, "--end-of-options")) {
 				seen_end_of_options = 1;
 				if (filter & (DO_FLAGS | DO_REVS))
diff --git a/t/t1500-rev-parse.sh b/t/t1500-rev-parse.sh
index 3f9e7f62e4..a669e592f1 100755
--- a/t/t1500-rev-parse.sh
+++ b/t/t1500-rev-parse.sh
@@ -208,6 +208,23 @@ test_expect_success 'rev-parse --show-object-format in repo' '
 	grep "unknown mode for --show-object-format: squeamish-ossifrage" err
 '
 
+test_expect_success 'rev-parse --show-ref-format' '
+	test_detect_ref_format >expect &&
+	git rev-parse --show-ref-format >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'rev-parse --show-ref-format with invalid storage' '
+	test_when_finished "rm -rf repo" &&
+	git init repo &&
+	(
+		cd repo &&
+		git config extensions.refstorage broken &&
+		test_must_fail git rev-parse --show-ref-format 2>err &&
+		grep "error: invalid value for ${SQ}extensions.refstorage${SQ}: ${SQ}broken${SQ}" err
+	)
+'
+
 test_expect_success '--show-toplevel from subdir of working tree' '
 	pwd >expect &&
 	git -C sub/dir rev-parse --show-toplevel >actual &&